Ballpoint pen



FIG. 1 is a perspective view of a ballpoint pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is an enlarged top view thereof;

FIG. 5 is an enlarged bottom view thereof;

FIG. 6 is a right side elevational view thereof; and,

FIG. 7 is a left side elevational view thereof.

The broken lines illustrate portions of the ballpoint pen which form no part of the claimed design. 

CLAIM The ornamental design for a ballpoint pen, as shown and described. 